hey so I got the horn key and got the second of the "one sixth of the puzzle has been completed" things. I got the secondary fire for the second weapon. I am very confused as to what to do next I feel like I've explored all of the areas a few times over and cant figure out what to do.
The shaded woods in Hexen has this structure of "you find a key in one area -> go to the next area -> find another key -> go to the third area -> get the last key you need -> backtrack to find all the other switches". It's a small part of why it's hard to recommend Hexen to people who don't have a walkthrough on hand.
You can thank John Romero for that.